DESCRIPTION OF PLATE I.

FIG. 1. Forty eight-hours old bouillon culture. Diagrammatic drawing ma with camera lucida. Zeiss 2 mm. oil immersion objective and No. 6 compens ing ocular.

A, Chains of streptococci.

B, Skeins of interwoven chains of streptococci.

C. A chain showing the longitudinal and transverse division of the elemen which are sometimes observed.

FIG. 2. Cover-glass preparation of peritoneal exudate from a white mo which died forty-eight hours after an intraabdominal injection. Stained Gram's method and counterstained with eosin. Camera lucida drawing ma with 2 mm. oil immersion objective and No. 6 compensating ocular.

DESCRIPTION OF PLATE II.

FIG. 1. Cover-glass preparation of blood from a chicken inoculated int venously and which died in forty-eight hours. Preparation stained with B rel's blue. Camera lucida drawing made with Zeiss 2 mm. oil immersion a No 4 compensating ocular.

A, Nucleated red blood corpuscles.

B, Chains of streptococci.

C, Leucocytes.

FIG. 2. Section of liver of hen which died spontaneously and was forward by owner for examination. Camera lucida drawing with 4 mm. objective an No. 4 compensating ocular. Stained by Gram's method followed by eosin.

A, Liver cells undergoing parenchymatous degeneration.

B, Engorged capillaries. Only the nuclei of the red corpuscles can be seen. C, Branch of portal vein.

With higher magnification the streptococci may be seen in the capillaries well as in the parenchyma.